Having problems with sequencing gels. This has never happened before,
but the last 2 gels I've run have "expanded" during the pre-heat and
run!! That is the comb is pushed out the top of the gel during the
pre-heat and after about 30 mins of the run you can see gel coming out.
Any ideas? We haven't changed any solutions and have been running these
gels the same way for years!
Any help gratefully appreciated
Thanks